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Use Object Types and Collections
The Collection types and object types increase your efficiency by allowing for the realistic data modeling. The Complex real-world entities and relationships map directly into the object types. A well-constructed object model can improve the application performance by eliminating the table joins, decreasing the round trips, and the same.
The Client programs, involving the PL/SQL programs, can declare the objects and collections, and pass them as parameters, store them in the database, recover them, and so on. Also, by encapsulating the operations with data, the object types move data-maintenance code out of the SQL scripts and PL/SQL blocks into methods.
The Objects and collections are well-organized to store and retrieve as they can be manipulated as an entire. The object support is also integrated architecturally with the database; therefore it can take benefit of the many scalability and performance improvements built into Oracle8i.
Initializing Records The illustration below shows that you can initialize a record in its type definition. Whenever you declare a record of the type TimeRec, its 3 fields supp
%ROWTYPE: This attribute gives a record type which represents a row in the database table or a row fetched from a formerly declared cursor. The Fields in the record and corresp
Updating Variables For assignment, SQL uses the key word SET, as in SET X = X + 1 (read as "set X equal to X+1") rather than X: = X + 1 as found in many computer languages.
MERGE and TRUNCATE in SQL SQL has two more table update operators, MERGE and TRUNCATE. MERGE, like INSERT, takes a source table s and uses it to update a target table t. Brief
Forward Declarations The PL/SQL needs that you declare an identifier before using it. And hence, you should declare a subprogram before calling it. For illustration, the decla
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Using FOR UPDATE If you declare a cursor which will be referenced in the CURRENT OF clause of an UPDATE or DELETE statement, you should use the FOR UPDATE clause to obtain an
Creating a SQL file 1. Open a new file in Notepad++ and save it to the location c:\mysql\bin, with the name lab8script.sql (the file extension should be .sql ). Add a MySQL co
INSERT Statement The INSERT statement adds fresh rows of data to the specified database table or view. Syntax:
Avoid the NOT NULL Constraint In the PL/SQL, using the NOT NULL constraint incur a performance cost. Consider the illustration as shown below: PROCEDURE calc_m IS m NUMB
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